In case anyone finds this thread in search of answers, the type is stamped into the cv joint. I was able to crawl under the car, and with a bit of wriggling, clean the outside of the cv joint and get some pictures of the outside casing. The code will tell you how many splines
HLJ75 = ME733 (OE: 31216175) 24 spline
LJ75 = ME735 (OE:31216176) 19 spline
BJ75L = ME734 (OE:21216177) 20 spline
https://www.driveshaftparts.co.uk/in...6&search=bj75l
is a good source for the parts.